Stack Trace: Could not load file/assembly 'App_Web_ar38yncj

[bobr2k]

I had been up and running for the last three or four days until something happened yesterday. Does anyone out there have any idea what would cause this? (See background below)
Stack Trace:

[FileNotFoundException: Could not load file or assembly 'App_Web_ar38yncj, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.]
ASP.AdminHeader.__BuildControlTree(AdminHeader __ctrl) +0
ASP.AdminHeader.FrameworkInitialize() +19
System.Web.UI.UserControl.InitializeAsUserControlInternal() +31
System.Web.UI.UserControl.InitializeAsUserControl(Page page) +14
ASP.admin_admin_master.__BuildControlAdminHeader1() +49
ASP.admin_admin_master.__BuildControlform1() +242
ASP.admin_admin_master.__BuildControlTree(admin_admin_master __ctrl) +102
ASP.admin_admin_master.FrameworkInitialize() +34
System.Web.UI.UserControl.InitializeAsUserControlInternal() +31
System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +2025712
System.Web.UI.Page.get_Master() +48
System.Web.UI.Page.ApplyMasterPage() +18
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +543
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BACKGROUND: Windows XP, Sql Server 2000, Home Page as Administrator, click on edit window, click on Content Edit icon, clicked on HTML closed that then clicked ADMIN ... since that time I've not been able to get to the default admin page without getting the above fail. I've made no changes to the system other than css files ... this is based on checking modified date on all files.

[Shopping Cart Admin]

Hello Bob,

I know support has been trying to figure this one out, I've been doing some searching on the Internet. This looks mighty similar:

http://support.microsoft.com/kb/915782/en-us

Had you changed one of the pages recently?

You may receive an InvalidCastException error in a Microsoft ASP.NET-connected Web application when the following conditions are true: • The Web application uses a master page, a user control, or pages that reference each other.
• The master page, the user control, or the pages are batch compiled into a single assembly.
• One of the batched dependencies is changed and causes a recompilation.
• A dynamic call to load a reference is made, such as a call to the LoadControl method.

[Shopping Cart Admin]

Hello Bob,

From another post:

The only Temporary fix is to make a small change in the offending user control, and copy it to the production server.

[Shopping Cart Admin]

Hello Bob,

I believe the change you made it web.config initiated a re-compile which solved this in a similar way the above method would.